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Tag: X25

  • WAN Protocol Characteristics

    Frame Relay

    • Provides point to point connections by creating virtual circuit paths.
    • Forwards frames and performs error check only at the end points.

    X.25

    • Is designed to operate over unreliable network lines
    • works with the physical, data link and network layers of the OSI model.

  • Packet Switching / WAN Technology

    • X.25: defines communication between DTE and DCE devices.
    • Switched multimegabit data services (SMDS):
      • Is a connectionless protocol and can provide bandwidth for exchange of large amounts of data.
      • A connectionless, high-speed, datagram-based WAN technology for communication over public data networks.
    • Frame Relay: Forwards packets to their destinations and doesn’t unpack frames at each node.
    • Link access procedure balanced (LAPB): Ensures that frames are conrrectly sequenced and error free.
    • Asynchronous transfer mode (ATM):
      • transmits data in fixed size cells of 53 byte and can provide bandwidth on demand.
      • Connection oriented switching technology that uses a cell-switching method.
    •  Synchronous data link control (SDLC): bit oriented synchronous protocol.
    • High level data link control (HDLC): A bit oriented data link protocol.
    • Switching: A virtual connection which acts like a dedicated link between the sender and the receiver devices.
    • Password authentication protocol (PAP): uses an authentication server to compare supplied credentials against stored credentials.
    • Challenge handshake authentication protocol (CHAP): enables user auth without revealing a shared password between two entities.
    • Extensible Authentication Protocol (EAP): works directly at the data link layer.
    • Point-to-point protocol (PPP): Supports asynchronous and synchronous connections and network protocol multiplexing.
    • Serial Line Internet Protocol (SLIP): Frames datagrams for transmission but doesn’t provide error detection or data compression.